linux-kernel - Re: [DEBUG PATCH] demonstration of hang in sched domain partitioning code

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Date:	Sun, 7 Oct 2007 17:40:46 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Paul Jackson <pj@....com>
Cc:	Andrew Morton <akpm@...l.org>, Cliff Wickman <cpw@....com>,
	Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Dinakar Guniguntala <dino@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [DEBUG PATCH] demonstration of hang in sched domain partitioning code

On Friday 05 October 2007 19:24, Paul Jackson wrote:
> Nick,
>
> I'm running into a problem trying to use your suggested
> partition_sched_domains(cpumask_t *partition) routine the way
> I thought I was supposed to be able to use it.
>
> If I ask to set up the same partition twice in a row having
> just one CPU in it (a singleton) the kernel hangs.
>
> I don't know enough about kernel/sched.c to be able to debug
> this very efficiently.  Any chance you could take a look?

Hi Paul,

Yeah I'll take a look. Meanwhile, as Ingo said, the recent patch you
sent is reasonable enough because the most critical thing to do is
to allow users to move away from the old interface.

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